Diet by blood type

The Blood Type Diet is an assumption made by nutritionist Peter D’Adamo in his popular book about the best diet for each of the four blood types. The author argues that following a proper diet ensures not only weight loss, but overall health, and recommendations range from a strict vegetarian diet for blood type 2 to a meat-based paleo diet for group 1.

Unfortunately, modern research suggests that, despite the presence of a certain logic in the theoretical basis of a diet by blood group, it is impossible to give an unambiguous and universal recommendation for the use of food products solely on the basis of a single characteristic of metabolism. In fact, such a recommendation simply will not take into account the enzymatic and endocrine activity of a particular person¹.

In addition, there was no statistically significant association between adherence to the blood type diet, weight loss, or any measurable improvement in health status. Ultimately, in order to lose weight, it is necessary to either reduce the calorie intake or to give up carbohydrates. Recall that the keto diet is based on restricting carbohydrates.

Does losing weight by blood type work?

The basic recommendations described in the book by Peter D’Adamo “4 blood groups – 4 lifestyles” are quite universal and suitable for any person advice on healthy eating. In fact, for weight loss, the author of the diet recommends giving up white flour and gluten, fast carbohydrates, sugary soda and excessively fatty foods. The positive effects of yoga and meditation are described in detail.

Even “meat-eaters” with 1 blood group are advised to consume exclusively meat of organically grown animals, free of hormones and antibiotics – and not sausages and other semi-finished products at all. At the same time, we note that simplified lists of permitted and prohibited products for each of the blood groups that can be found on the Internet are often very far from the advice of the book.

Blood type nutrition

As such, the blood type diet divides all people into four types – “hunters” with blood group 0 (I), “farmers” with blood group A (II), “nomads” with type B (III), and mixed type with type AB (IV). The author of this diet claims that not only the type of diet most suitable for a person’s health depends on the blood group, but also his physique and even mentality.

Blood type Medical designation Name The best diet
First 0 (I) “Hunters” Meat eater
Second A (II) “Farmers” Vegetarianism
The third B (III) “Nomads” Gluten-free
Fourth AB (IV) Mixed type Refusing milk

Meals by blood group 1

Hunters with the first blood group are classified as sports mesomorphs and are endowed with increased stress resistance and strong immunity, disturbed by the use of gluten and cereals. A meat-rich paleo diet is recommended for them.

Meals by blood group 2

The second blood group “farmers” are described as somewhat hysterical people, able to get rid of excessive stress solely through the transition to vegetarianism and a complete rejection of meat. Meditation is also recommended for people with blood group 2.

Meals by blood group 3

The Blood Type 3 Diet, or the Nomad Diet, also means avoiding gluten. For the rest, nutrition for the third blood group is recommended according to the principle of a carbohydrate-free diet.

Meals by blood group 4

Blood group 4, according to Peter D’Adamo, is mixed – that is, having the characteristics of several other groups. The main rule of nutrition for owners of the fourth blood group is to avoid milk and other lactose-containing foods.

Lists of allowed and prohibited products

It is necessary to separate the dietary recommendations by blood type, given in the original books of Peter D’Adamo, and the “anonymous” food compatibility charts in the form of “meat-eaters” and “no vegetarians” published on various sites. Source books divide each blood group into 6-7 types with individual and rather detailed recommendations.

In addition to the differences between “secretaries” (people who contain information about the blood group in their saliva) and “non-secretaries”, D’Adamo argues that representatives of the European, Asian and African genetic groups must eat differently, even if they have the same blood group. In other words, even the author himself does not give universal rules for a diet for weight loss, suitable for absolutely everyone.

Blood Type Diet: Scientific Opinion

As part of the analysis of all available scientific works (about one and a half thousand studies) on the relationship between blood type and health, only 16 studies partially confirmed that adherence to a diet according to blood type can somehow affect the body(one)… The remaining hundreds of studies have not found any connection between health, nutrition, and blood type.

It is also important that at the moment there is not a single scientific study proving the direct effect of adherence to a diet according to the blood group with real weight loss or with improved health.(3)… Interestingly, even the author himself very carefully talks about the effect of his proposed diet on weight loss and fat burning, mentioning the modest figures of 3-4 kg.

Diet by blood type: history

The author of the blood type diet, Peter D’Adamo, claims that his theory is based on centuries-old observations of the Japanese, linking temperament and a specific blood type. There are no references to sources of information or any specific research in his books, just as nothing is said about the basis on which the author divides specific products into useful and harmful.

It should also be noted that Peter D’Adamo is not a practicing doctor and does not have any scientific degrees. In simple terms, the theory of the relationship between diet and blood type, invented and described by him in the book, is exclusively his private opinion, based on his own comparison of facts, but not on any scientific data.

Final opinion

The theory that a person with a certain blood type should follow a strict diet, giving up some foods and increasing the consumption of others, has no scientific basis. However, Peter D’Adamo’s book is definitely able to set a person on the path of healthy eating. The main thing is not to treat his recommendations as a final and unshakable law.

If you, trying to lose weight, decided to follow a “meat” diet, since you have the first blood group, but have not even read the original book, this is an unambiguous mistake that can lead to an unpredictable result. Remember that understanding the basic physiology of fat burning is important for effective weight loss, and not just dividing foods into good and bad.


A blood type diet recommending a meat meal for the first blood group, strict vegetarianism for the second blood group, and a moderate diet for other blood types has not been supported by any research. Modern scientists believe that if there is a connection between a particular blood type and an optimal diet, it is not simple enough to describe it in a universal table.

Information sources:

  1. Blood Type Diet: Fact or Fiction ?, source
  2. Blood type diets lack supporting evidence: a systematic review, source
  3. The Blood Type Diet: An Evidence-Based Review, source

Date of the last update of the material – April 3, 2019

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